Changing dialogue in prosites upgrade screen

Hi, I have attached a screenie of my question.
I want to change the text that appears to the left of the pricing table. All three boxes contain text that my clients will see and is out of context to the situation as the words actually only apply to myself as super admin.
What I want them to see is a short description of the premium plugins they will get when upgrading.
Which file can I alter to get the text how I want it please?